Archaeal and bacterial communities across a chronosequence of drained lake basins in arctic Alaska
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Archaeal and bacterial communities across a chronosequence of drained lake basins in arctic Alaska. / Kao-Kniffin, J.; Woodcroft, B. J.; Carver, S. M.; Bockheim, J. G.; Handelsman, J.; Tyson, G. W.; Hinkel, K. M.; Mueller, C. W.
I: Scientific Reports, Bind 5, 18165, 2015.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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T1 - Archaeal and bacterial communities across a chronosequence of drained lake basins in arctic Alaska
AU - Kao-Kniffin, J.
AU - Woodcroft, B. J.
AU - Carver, S. M.
AU - Bockheim, J. G.
AU - Handelsman, J.
AU - Tyson, G. W.
AU - Hinkel, K. M.
AU - Mueller, C. W.
PY - 2015
Y1 - 2015
N2 - We examined patterns in soil microbial community composition across a successional gradient of drained lake basins in the Arctic Coastal Plain. Analysis of 16S rRNA gene sequences revealed that methanogens closely related to Candidatus Methanoflorens stordalenmirensis were the dominant archaea, comprising >50% of the total archaea at most sites, with particularly high levels in the oldest basins and in the top 57 cm of soil (active and transition layers). Bacterial community composition was more diverse, with lineages from OP11, Actinobacteria, Bacteroidetes, and Proteobacteria found in high relative abundance across all sites. Notably, microbial composition appeared to converge in the active layer, but transition and permafrost layer communities across the sites were significantly different to one another. Microbial biomass using fatty acid-based analysis indicated that the youngest basins had increased abundances of gram-positive bacteria and saprotrophic fungi at higher soil organic carbon levels, while the oldest basins displayed an increase in only the gram-positive bacteria. While this study showed differences in microbial populations across the sites relevant to basin age, the dominance of Candidatus M. stordalenmirensis across the chronosequence indicates the potential for changes in local carbon cycling, depending on how these methanogens and associated microbial communities respond to warming temperatures.
AB - We examined patterns in soil microbial community composition across a successional gradient of drained lake basins in the Arctic Coastal Plain. Analysis of 16S rRNA gene sequences revealed that methanogens closely related to Candidatus Methanoflorens stordalenmirensis were the dominant archaea, comprising >50% of the total archaea at most sites, with particularly high levels in the oldest basins and in the top 57 cm of soil (active and transition layers). Bacterial community composition was more diverse, with lineages from OP11, Actinobacteria, Bacteroidetes, and Proteobacteria found in high relative abundance across all sites. Notably, microbial composition appeared to converge in the active layer, but transition and permafrost layer communities across the sites were significantly different to one another. Microbial biomass using fatty acid-based analysis indicated that the youngest basins had increased abundances of gram-positive bacteria and saprotrophic fungi at higher soil organic carbon levels, while the oldest basins displayed an increase in only the gram-positive bacteria. While this study showed differences in microbial populations across the sites relevant to basin age, the dominance of Candidatus M. stordalenmirensis across the chronosequence indicates the potential for changes in local carbon cycling, depending on how these methanogens and associated microbial communities respond to warming temperatures.
U2 - 10.1038/srep18165
DO - 10.1038/srep18165
M3 - Journal article
C2 - 26681584
AN - SCOPUS:84950283213
VL - 5
JO - Scientific Reports
JF - Scientific Reports
SN - 2045-2322
M1 - 18165
ER -
ID: 239161030